!!! someone finally responded !!!
I'm part of the BimmerAlliance crew in the DC Metro area and we have quite a few meets regularly, however not many Z's are part of the crew.
Mondays - Hardtimes Springfield, VA starting around 8-8:30PM
Thursdays - Fairfax Corner, VA starting around 8-8:30PM
Saturdays - Quite a few options for makes/models of all cars
Bethesda Cars and Coffee
Great Falls Cars and Coffee
Sundays - Fair Lakes, VA Cars and Coffee
I believe we also do monthly meets in rockville, MD. I'll get back to this post with more info on that one.
'04 Z4 3.0i - Stubby Antenna, OE Clear Kit, OE Front Aero, OE E46 Aux Kit, Smoke Tinted Front Ambers, Sound Gen Mod, Muffler Delete, Matte Black Grills, RPI Red Scoop, Dinan CAI, Windblox Screen, gapTech RCH+, CDV Delete, Clutch Stop, AutoSolutions SSK, ZHP Knob, USMillWorks Front Plate, 15&20mm Spacers, TEIN SS Coils, RE Race Brace, RE RSM